GST liability in GSTR 9

Respected Members,

In filed 3B we charged excess GST liability on sales by Rs. 100 And also claimed excess ITC in filed 3B by Rs. 120. Here also note that GST liability was paid through ITC (not through cash).

Whether we need to pay net off liability in GSTR 9 by Rs. 20 in cash ( 120-100)

OR

We need to pay Rs.120 in cash (excess claimed ITC)  and claim refund of Rs.100 (excess on sales).

Thanks